Electric-arc lamp.



Patented Jan. 29, I901.

c. a. HARTHAN.

ELECTRIC ARC LAMP.

(Applicc-tion fllad Oct. 2, 1899.)

2 Sheafs-Sheet 2,

(No Nodal.)

chafles E. Harthan UNITED STATES PATENT CFFIoE.

CHARLES E. HARTHAN, OF LYNN, MASSACHUSETTS, ASSIGNOR TO THE GENERAL ELECTRIC COMPANY, OF NEW YORK.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 667,129, dated January 29, 1901.

Application filed October 2, 1899. Serial No. 732,261. (No model.)

To whom, it may concern.-

Be it known that I, CHARLES E. HARTHAN, a citizen of the United States, residing at Lynn, county of Essex, State of Massachusetts, have invented certain new and useful Improvements in Electric-Arc Lamps, (Case No. 889,) of which the following is a specification.

The present invention relates to electricarc lamps, and more particularly to those of the focusing type, and has for its object to improve and simplify their construction, as will be more fully pointed out hereinafter.

In the accompanying drawings,which illustrate an embodiment of my invention, Figure 1 is an elevation of an arc-lamp with the easing and globe in section. Fig. 2 is a trans verse section taken on line 2 2 of Fig. 1. Fig. 3 is a detail view of the feeding mechanism with a part of the framework broken away. Fig. L is a plan view of the feeding mechanism, and Figs. 5 and 6 are detail views of the gearing and ratchet.

Referring more particularly to Fig.1,A represents a cast-metal top or cover having a ring formed integral therewith by which the lamp is suspended. Extending downwardly from the cover are two bosses, and to these bosses are secured the side frames B and B. Secured to the side frames is a solenoidinagnet C, and mounted for movement within the solenoid is a laminated-iron core or armature C. two-part rectangular frame D, and mounted in the frame are the gearing, sprocket, and ratchet, constituting the feed mechanism of the lamp. Each portion of the frame is provided with two extensions D, and passing through these extensions are securing bolts or screws D This is a very cheap construction, and the feed mechanism may be readily removed therefrom for inspection or repair. The frame is pivotally supported from opposite sides by screws B and each screw is provided with a check-nut to prevent it from turning accidentally. By means of this construction the frame may be moved laterally, so as to bring the centers of the L-shaped rods and those of the magnet and dash-pot into coincidence. This greatly simplifies the act of alining the parts and is particularly Pivot-ally secured to the side frames is a desirable where a lamp is being assembled which has been taken down for the purpose of repairs. Secured to the left-hand end of the frame by the bolt or screw D is a holder D and mounted therein is an L-shaped rod D The vertical portion of the rod extends upward through the core 0, and surrounding the rod are coiled springs D one above and the other below the core. This arrangement reduces the humming of the lamp by absorbing the vibration.'

To check violent movements of the feed mechanism, a dash-pot E is secured to the top of the lamp in any suitable manner and the piston is connected to the frame by an L- shaped rod E, the bolt D serving to secure the rod as well as to hold the parts of the frame together. By arranging the core on one side of the center of movement and the dash-pot on the other a steady feed for the lamp is obtained. This arrangement also gives great leverage, and by reversing the L shaped rods with respect to each other the solenoid and cylinder can be placed in close proximity, thereby reducing the size of the lamp.

I The lamp being of the focusing type, it is necessary to feed both carbons, and to accom plish this the carbon-holders are connected by a chain F or other flexible connector, which passes over a sprocket-wheel F, which is mounted in the frame D.

The feeding of the carbons is regulated by an escapement which is constructed as follows: Mounted in the frame D, Figs/l to 6, is a shaft G, and rigidly secured thereto are the sprocket F, the sleeve F and the ratchet F Loosely mounted on the sleeve is a gear H, which meshes with a pinion H which is rigidly secured to the shaft I. Mounted on the gear H for engagement with the ratchet is a pawl H. This pawl is held in engagement with the ratchet by a spring H and the parts are so arranged that the carbon-holders may be separated by hand when it is desired to recarbon the lamp. Secured to the pinion-shaft I is a scape-wheel J, and mounted on an oscillating shaft K for engagement with the scape-wheel is a pallet K. Extending upward from the pallet is a finger or projection K having a knife-like edge, which engages with a corresponding finger or projection L, that controls the action of the escapement. The finger L is carried by an arm L, which is pivotally supported by the screw B which also supports the frame D. On this arm are two stops L and L the former limiting the downward movement of the arm by stril ing the right-hand side of the framepiece B and the latter limiting the upward movement of the arm by striking the left-hand side of the same frame-piece. A coiled spring L surrounds the pivot and tends at all times to hold the arm in the position shown. It sometimes happens during the operation of the lamp that the knife-edges on the arms or projections K and L will exactly coincide. In this event the spring L will permit the arm to move upward slightly until the arm or pro jection K can slip past the projection L, after which the arm L returns to the position shown.

The verticaliy-extendiug frame-bars B and D are secured at their lower ends to a plate M, the plate and frame-bars being insulated from each other by strips of insulating material N and N and by bushings N The plate and insulating strips are perforated at two points to permit the chain F to pass. The strip N is made of some soft material-as felt, for exampleand as the carbons feed the felt wipes the chain, thereby cleaning it and at the same time prevent-ing dust and dirt from passing upward into the mechanism-chamber of the lamp. Projecting downwardly from the plate are two sockets M for receiving the upper ends of the tubular side rods M The latter are secured in place by screws M which pass through the plate into the upper ends of the tubes. On the sides of the sockets are forks M, arranged to receive the projections O on the casing O, which surrounds the feed mechanism.

Mounted for vertical movement on the side rods are two clamps P. These clamps are similar in construction, each being secured to the intermediate section Q of the casing and being provided with two projections through which the side rods pass. Projecting through the casing is a thumb-screw P for securing the clamp in place. Secured to the upper casing and surrounding the upper end of the intermediate section is a cornice O This permits considerable variation in the adjustment of the intermediate section and at the same time covers the joint between the parts, thereby keeping out bugs and dirt and improving the appearance of the lamp. On the lower end of casing Q is an outwardlyfiaring ring Q, which rests on the lamp-globe and prevents sparks and carbon dust from getting outside of the lamp. The construction of the ring is such that wide differences in sizes of globes are permitted.

Located about midway on the side tubes is a reflector R, having a porcelain coating on the under side. This reflector aids in the distribution of light from the arc. The reflector is supported from the plate M by two parallel rods R, which are displaced ninety degrees from the side rods. The side rods assist in holding the reflector in position, and on the right-hand side of the lamp,wherc the reflector is cutaway to permitthe sleeve Sof the lower holder to pass n pward, an in verted U shaped uide R is em loved which is seen red to the D p v 3 upper side of the reflector. The upper car bon passes through an opening in the reflector, and located in this opening and surroundingtl'iecarbon isa bushing Riot lava or some similar material, for insulating and guiding the upper carbon.

On account of the moving of the lower-carbon holder it is necessary to have some form of moving connection, and to avoid the use of flexible cables near the arc and the disadvantages thereof a conducting-rod S is sesured to the lower holder and passes upward through the reflector, an insulating-bushing being provided at that point. The upper end of the rod is secured to the chain F by an insulating-holder S This holder also acts as a clamp for the cable S The other end of the cable is connected to a post S, which is cured to the underside of the frame-plate hi. The holder T for the upper carbon is made heavy, so that it always tends to move the carbons. The ends of the holder are forked, as shown in Fig. 2, and are arranged to move vertically on the guide-rods R. Extending downwardly from the frame-plate M is a post T, and connected to this post and to the upper holder is a cable T for conveying current to the upper carbon. The arrangement of carbon-holders and cables has been found to be very satisfactory, as all of the connections are located at a point above the are, where they will not interfere with the distribution of light. The rod S being small and directly in line with the side tube, no additional shadow is cast thereby when the lamp is in operation.

It will be seen that the lower-carbon holder U, the yoke U, connecting the side'rods, and the yoke V, connecting the globe-supporting rods, are substantially V-shaped. This permits the use of a comparatively small globe and one having a small lower end together with long lower carbons havinga wide range of movement. The lower-carbon holder is secured to a sleeve S, which moves vertically on the right-hand side tube. The left-hand end of the holder is guided by an insulatingbushingas porcelain, for example-which surrounds the left-hand rod. The holder is forked on the bushing end, so that it may be readily removed when detached from the sleeve S. The globe is mounted in a holder 'W, which is secured to the yoke WV by a bayonet-lock.

To lower the globe, it is first necessary to raise the holder slightly, then give a partial turn to the right.

The action of the lamp is as follows: Ourrent on being admitted to the lamp energizes the solenoid O, causing it to attract the core. This tilts the frame D and causes the carbons to separate. As the carbons are consumed the core 0 gradually drops until the finger K moves out of engagement with the finger L. This permits the carbons to feed slightly, due to the preponderance of weight in the upper holder. This is again slightly raised and the finger K brought into engagement with the finger L, the action being repeated as often as is necessary.

Lamps constructed as above have been tested and found to be very satisfactory, the sensitiveness of the feeding being especially pronounced. In certain instances the action was so quick that the feed was only one halftooth at a time.

What I claim as new, and desire to secure by Letters Patent of the United States, is-

1. In an electric-arc lamp, the combination of a two-part pivoted frame, each part having an extension by means of which the two parts are secured together, gearing mounted in the frame, an escapement controlling the feeding of the carbons,andaspring-controlled means for regulating the action of the escapement.

2. In an electric-arc lamp, the combination of a stationary frame,pivoted frame mounted thereon, an escapement controlling the feeding of the lamp, an arm for controlling the escapement which has the same center of movement as the frame, and a lug on the arm which engages with the stationary frame and regulates the feeding.

3. In an electric-arc lamp, the combination of a two-part pivoted frame, a separate and adjustable pivot for each part of the frame whereby the frame as a whole may be adjusted laterally, a magnet and an armature for moving the frame, a dash-pot, the magnet and dash-pot being located on opposite sides of the center of motion of the frame and L- shaped connecting-rods between the armature and the frame and between the dash-pot and the frame.

4. In an arc-lamp,the combination of a twopart pivoted frame, a separate adjustable pivot for each part of the frame whereby the frame as a Whole may be shifted laterally so that the center of the L-shaped rods shall be made to coincide with the centers of the magnets and the dash-pot, L-shaped rods connecting the frame to an armature and to a dashpot, and means for securing the parts of the frame together and at the same time acting as pivots for the L-shaped rods.

5. In an electric-arc lamp, the combination of a framework supporting certain of the operating parts of the lamp, a framework secured to the first for supporting certain other parts of the lamp, a body of felt which is located between the two parts of the frame and is secured in place by the frame-clamping means, said felt being provided with a perforation, means for clamping the parts of the frame together, a carbon-holder, and a carhon-carrier which is connected to the holder and extends through the perforation and is wiped by the felt'as it moves up and down.

6. In a focusing arc-lamp, the combination of carbon-holders, a chain connecting the holders, a two-part frame having perforations in one of the parts through which the chain passes, a body of felt located between the parts which wipes the chain as it moves up and down, and means for securing the parts of the frame together and at the same time holding the felt in place.

7. In an electric-arc lamp, the combination of a pair of side rods, a sleeve mounted on one of the rods, a carbon-holder clamped to the sleeve, an insulator arranged to move vertically on the other rod, and means for securing the insulator to the holder.

8. In an electric-arc lamp, the combination of side rods, a reflector secured thereto, an inverted-U-shaped guide secured to the reflector, which surrounds one of the side tubes, and a holder for one of the carbons having a sleeve surrounding one of the tubes, the said sleeve being arranged to extend into the said guide.

9. In an electric-arc lamp, the combination of a globe and a movable holder therefor, side rods, a two-part casing, one of said parts being normally fixed in position, the other part being movable for the purpose of adjusting and inspection, and clamps movable on the side rods to which the moving section of the casing is secured.

In witness whereof I have hereunto set my hand this 28th day of September, 1899.

CHARLES E. HARTHAN.

Witnesses: I

DUGALD MOKILLOP, ALEXANDER J. R. FIEGO. 

